One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,18,23,36,22,26,21,27)(19,28,35,24,29,43,31,38)(20,25,37,48,33,42,34,41)(30,44,47,39,32,46,45,40)(11,12)(14,15)(17,19)(18,24)(20,32)(21,35)(22,29)(23,31)(25,40)(26,38)(27,43)(28,36)(30,33)(34,45)(37,47)(39,42)(41,44)(46,48) involution — undirected(2,5)(6,8)(9,11,13,12)(10,14,16,15)(19,29)(24,38)(28,43)(30,32)(31,35)(39,40)(44,46)(45,47)(9,12,13,11)(10,15,16,14)(17,20,22,33)(18,25,26,42)(19,30,29,32)(21,34,23,37)(24,39,38,40)(27,41,36,48)(28,44,43,46)(31,45,35,47)(1,3,4,7)(2,6,5,8)(10,16)(14,15)(18,26)(20,33)(24,38)(27,36)(28,43)(30,32)(34,37)(45,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.